Snippet showing how I created a feature layer from an array of features

showFiresSnippet.js

showFires:function(featureArray){
  //remove the firelayer if it's in the map
  var lyr = this.map.getLayer("fireLayer");
  if(lyr){
      this.map.removeLayer(lyr);
  }
  //setup the definition for the layer
  //this includes the renderer
  var layerDefinition = this.getFireLayerDefinition();
  var featureCollection = {
    layerDefinition: layerDefinition,
    featureSet: {
      "geometryType": "esriGeometryPoint",
      "features":featureArray
      }
  };
  //create the feature layer...
  var fireLayer = new esri.layers.FeatureLayer(featureCollection, {
    mode: esri.layers.FeatureLayer.MODE_SNAPSHOT,
    id: "fireLayer",
    visible:true
  });
  //hover handler
  dojo.connect(fireLayer, "onMouseOver",function(evt){
      $('#fire-tooltip').html(evt.graphic.attributes['fire_name'])
          .css('top', evt.pageY)
          .css('left', evt.pageX)
          .show();
  });

  dojo.connect(fireLayer,"onMouseOut", function(evt){
      $('#fire-tooltip').hide();
  });
  this.map.addLayer(fireLayer);
  Viewer.vent.trigger("Feedback:Hide");
}